Rotary disk.



G. H. MUKEE.

ROTARY DISK.

APPLICATION FILED JANA, 1910.

Patented Nov. 4, 1913.

avwentoz COLUMBIA PLANOGRAFH CHARLES H. MCKEE, or rrTrs Un-en, PENNSYLVANIA,

norAnY DISK.

Specification of Letters Patent.

Patented Nov. 4;, 1913,

Application filedfl'anuary 4, 1910. Serial No. 536,340.

To all 'whom'z't may concern:

Be it known that I, CHARLES H. MoKnu,

a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and tary concave disks are employed. Disks of the type referred to are usually made of sheet steel, about five thirty-seconds of an inch, or thereabout, in thickness, and of the form of slices of a hollow sphere. A

disk of the type mentioned, twenty-fourinches in diameter across its face, and dished, or hollowed in its center, three and one-half inches, or thereabout, is about the standard size for deep plowing. Such disks in use, yield the best results when provided with a sharp double beveled edge, around their rims, having the bevel of such edge, on the outer or convex side of the disk, an inch or more in width from the edge, and with each disk so set that as the implement is carried forward in use, the bevel on the outer side of the disk comes in contact with and presses slightly against the land side, or upright part of the wall of the furrow, made by the disk. Heretofore, it has been the practice in making such disks with double beveled edges, to form the edge around the rim between the inner and outer walls of the disk by cutting away, or removing, all of the material outside of the bevels. Thus, when such an edge is formed in the manner mentioned, on a disk having a thickness of five thirty-seconds of an inch, having a bevel on the outside, of one and one-fourth inches in width, from the edge, and a bevel of five-sixteenths of an inch on the inner side, the material of the disk is so cut away that the thickness of the rim, at the base of the inner bevel, is but one-sixteenth of an inch, and that the disk gradually tapers from that thickness, to a thin edge at its rim. It is apparent that the edge thus provided is thin and frail and that the disk itself is much weakened by reason of the loss of material around its rim.

When used in implements of any of the kinds heretofore mentioned it is important that the edges and all parts of the rotary disks employed, (especially when hard provided with a bearing 12 ground, or rocks or roots are encountered) shallbe of suflicient strength to withstand hard shocks and strains, and therefore the object of this invention is to provide a concave rotary disk, having a double beveled edge, and of comparatively great strength at its edge, or outer rim, and also to provide a disk capable of greater wear than disks. of other forms heretofore usec.

The invention will be hereinafter fully set forth and particularly pointed out'in the laims.

In the accompanying drawing :Figure 1 is a vertical cross-section of a disk embodying my invention, said section being taken through the center and at right angles to the face of the disk, the lower edge of the disk being illustrated as resting on the bottom of its furrow. Fig. 2 is a horizontal sectional view taken through the center of the disk illustrating the latter in the position in which it is used in its furrow. Fig. 3 is an enlarged detail View illustrating the cutting edge. Fig. 4 is a similar view illustrating the old method of forming the cutting edge.

Referring to the drawing, 10 designates a standard carried by a suitable frame, and

adapted to receive the hub 13 of a disk supporting flange let. The disk 15 is secured to said flange by means of a bolt 16 passed through a suitable opening in the center of the disk and eX- tended through a bore formed in the hub 13. Said disk 15 is concaved and provided with a cutting edge 17, formed by making a strip around the rim of the disk at 18 in the form of a segment of a curve made by a plane parallel with the base thereof, thereby providing the outer face with a bevel 19, the inner face of the cutting edge being provided with a bevel 20 which meets the bevel 19. It will be noted in this connection that the bevel 19 is considerably larger than the bevel 20, the latter conforming substantially to the plane of the face of the disk, being formed by cutting away the metal forming the corner of the inner face of the disk at the rim thereof. By bending the rim of the disk and beveling off the inner edge thereof, a keen cutting edge is provided without reducing the thickness of the body of the disk at that point, whereby the edge of the disk is sustained by sufficient thickness of metal at its base to render it strong and serviceable. As the disk on its outer bevel is worn by friction against the landside and bottom of the furrow, the bevel on the inner side is worn to some extent by the plowed earth as it passes out of the rear side of the face of the disk. In case the wear is not sufficient, however, to preserve the bevels of their proper relative dimensions, the bevel 20 may be corrected and a sharp edge provided by using an ordinary file and passing the same back and forth across the rim of the disk, with the end of the file coming inside the rim, held in the plane of the face of the disk, or depressed in the dish or hollow of the disk, so as to make the edge of the desired angle. In this manner, with a little care, the form of the edge may be varied at pleasure, and a very deep and strong cutting edge may at all times be readily provided.

I claim as my invention 1. A disk for tilling machines comprising a continuously curved concavo-convex body of uniform thickness throughout, said body being bent inwardly adjacent the edge in a straight line to provide a beveled portion forming an annular rim, the edge of said rim being provided with an inner bevel arranged at an angle to the plane of the rim and reaching to the outer edge of the latter.

2. A disk for tilling machines comprising a continuously curved concave-convex body of uniform thickness throughout, said body being bent inwardly adjacent the edge in a straight line to form an annular rim, the edge of said rim being provided with an inner bevel arranged at an angle to the plane of the rim and reaching to the outer edge of the latter said bevel being narrower than the width of said rim.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

CHARLES H. MoKEE. lVitnesses:

A. H. MONAMEE, A. A. RoTTHAUs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. G. 

